Hii @kartik,
This code:
app.all('*', function (req, res) {
res.sendFile(__dirname+'/index.html') /* <= Where my ng-view is located */
})
tells Express that no matter what the browser requests, your server should return index.html. So when the browser requests JavaScript files like jquery-x.y.z.main.js or angular.min.js, your server is returning the contents of index.html, which start with <!DOCTYPE html>, which causes the JavaScript error.
Hope it helps!!